My buddy bought a 2019 Limited last August, told me he couldn't get his cover to fit right, from the factory/dealer? I recommended what I had on my 2017 Ram & later on the 2019 Ram (DT). It's a RetraxONE rolling tonneau cover.
I haven't had much water in the bed, if any. Good luck with your choice.
U.S.Navy - Ret.
The needs of the many are being forsaken for the wants of a few...
RetraxONE MX Tonneau Cover - Line-X Bed Liner - Tinted Windows - MOPAR Window Vent/Visors & Bug Shield - Husky Mud Flaps
R.I.P. 2017 Ram SLT Big Horn QC 4x4 (Totaled - 01/24/19)